British Style 100W Lead / Bass Guitar Tube Amp Kit


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SKU: G1B1W180
Weight: 30 lb
Sale Unit: Piece

In Stock


Amp Kit Difficulty Level


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Please read our article 'Mojotone Amp Kit Building Primer' along with our amp kit disclaimer located in the Specs tab before buying this kit.


Crank it up to 10 and let this amp sing. Modeled after the well-known Marshall Super Lead 100 and the Marshall Super Bass 100, this amp offers as much gain as it does tone. Bridge the channels like you would an original and get the clarity and gain of the first channel, and beef it up with the warmth of the second channel. This kit includes 4 JJ EL34 tubes and 3 12AX7 preamp tubes that bring this Class A/B amp into a realm of its own. The amp kit includes the parts to build either the Lead circuit or Bass circuit.

  • Class Type:AB All Tube Amplifier
  • Output:~100 Watts
  • Circuit:1966-1981 100 Watt Super Lead (1959 MKI) and 1966-1981 100 Watt Super Bass (1992 MKI)
  • Bias Type:Fixed Bias with an adjustable bias potentiometer
  • Build Time:~7 hours
  • Preamp Tubes: ECC83/12AX7 (3)
  • Output Tube(s): EL34 (4)
  • Rectifier Tube:None - Solid-state Rectified
  • Transformers:Power - Plexi / 800 100W (7020810), Output - Plexi / 800 100W (7021810), Choke - Plexi / 800 Choke (7022800)
  • Hardware:British 100W Lead / Bass Small Parts Kit, British 100W Chassis, Front & Rear Faceplates, Octal Base Clamps, 10' Removable Power Cord

Disclaimer: Some of the parts contained in this kit are subject to availability.

Mojotone reserves the right to change or substitute any and all of the parts contained in this amplifier kit without advertisement or notification to the buyer. Part substitutions made by Mojotone are guaranteed not to affect the integrity or operation of your amplifier kit. Time estimates listed are from start to finish. If you are new to tube amplifiers, additional time may need to be factored.


When purchasing a kit from Mojotone, you will receive the following documentation.

1. Schematic

2. Wiring Diagram / Layout

Our beginner level kits such as the tweed champ and tweed deluxe include a manual. If you purchase a kit from Mojotone and do not receive these documents, you can obtain copies by emailing or calling 800-927-6656. The Mojotone staff is available Monday through Friday from 8:30 a.m. to 5:00 p.m. EST unless otherwise closed.


Mojotone kits include the best quality parts that are available at the time of purchase. If a substitution is required, our team will use parts that are of equal quality to ensure the integrity of the kit build remains the same.


Building a fully functional amplifier kit is not an easy task. Before building a kit, one should have the ability to properly solder as well as read and understand a schematic and wiring diagram. While we do our very best to ensure all documentation is current, the included documentation is meant to serve as an overall guide to building the amplifier. Simply following the schematic and wiring diagram does not guarantee you will have a fully functional amplifier. In fact, post build troubleshooting is a common issue across all builds.


Our staff is available to assist with basic troubleshooting needs. There are plenty of online videos available that are helpful with most post build issues. Technical staff is available via email by sending a message to You may also call our sales team to discuss build problems, dial 800-927-6656 and press 1 for sales.


Building a tube amplifier takes time, dedication, resources and most importantly... Skills! The experience of building an amp can come with some frustration, the reward of completing the build is definitely well worth your time. Please review the wiring diagram, schematic and manual (if applicable) prior to making your purchase. Mojotone will not accept any returns on amplifier kits and/or parts that have been assembled, soldered or modified.

This amp kit also comes with the following documents. Please feel free to view and/or download them:

Mojotone British 100 Watt Lead Schematic

Mojotone British 100W Wiring Diagram

Mojotone British 100 Watt Bass Schematic

Ratings & Reviews

3 reviews

  • 4 stars
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  • 1 star
  • 0 reviews
4/3/2024 12:01 pm

Nice clean sounding amp

by Bob

Lacks characteristic plexi tone.

Preamp is clean w/o much distortion by design, need to max volume for plexi sounds. However this lacks the sounds i was wanting to hear even at full volume.

3/6/2023 8:38 pm

It sounds right

by Bill -

Built amp for son's graduation. Couple full Saturdays to build. Mojotone promptly shipped 2 missing parts. One bad solder joint took few hours to find. Son wanted to cry after first song he played "The New" by Interpol. Says he had been playing it for months and this was first time it sounded right. Will rock his college band. Versatile sounds great bass or lead guitar.